Placental maturity can be classified as grade 0, 1, 2 and 3. Grade 2 placenta usually occurs in late pregnancy and usually lasts for about 1 month, but placental aging may also occur earlier, with some individual differences, and needs to be judged according to the individual condition of the pregnant woman. The placental maturity is artificially classified by the ultrasonographer, so there may be some errors. In addition, there is no clear relationship between placental maturity and the time of delivery, as most pregnant women will deliver on their due date. A delivery after 37 weeks of pregnancy is considered full-term, and a full-term baby has a high chance of survival after birth. If there is a grade 2 placenta before 37 weeks, first of all, calcium supplementation should be prohibited because too much calcium may lead to placental aging. In addition, detailed laboratory tests and examinations need to be done to pay attention to whether the pregnant woman has any comorbidities, such as hypertensive disorders of pregnancy, which may lead to early placental aging, and to measure the blood pressure and urine protein of the pregnant woman. If the diagnosis is heavy gestational hypertensive disorder, she should be admitted to the hospital for relevant treatment in a timely manner, and if necessary, an early cesarean section is needed to terminate the pregnancy. If grade 2 placenta appears after 37 weeks, it is normal and does not require special treatment, only regular antenatal checkups. Weekly fetal heart monitoring is recommended, and if the fetal heart monitoring response is good, the fetus is relatively safe within 3 days. grade 2 placenta can be further classified into early grade 2 and late grade 2. If you want to have an elective cesarean section, it is better to perform the procedure at late grade 2 to avoid immaturity of the fetus and possible respiratory distress syndrome after birth. Most pregnant women will show a grade 3 placenta after 41 weeks of pregnancy, suggesting that the placenta is aging. The aging placenta is relatively insufficient to supply blood and oxygen to the fetus, which may easily cause fetal hypoxia, so it is not recommended to continue the pregnancy. If there is no aura of labor at 41 weeks, hospitalization is recommended to induce labor to avoid fetal danger.